[bad_username]

Documentation to code is what a database index is to database data. You can do full table scans but indices speeds up things by orders of magnitude. Similarly you can piece a big project picture together by reading all the code, but it will never be as fast as reading a good architectural overview or a description of concepts.

But, as a corollary, do not document what can be inferred quickly by looking at the code. I think that doc generators from code doctrings are not very useful.